综合灭火是采用（）等两种以上配合使用的灭火方法。

A.从架间打插管注水

B.用高压水枪灭火

C.向封闭的火区灌注泥浆

D.注入惰性气体

One morning my patience was growing thin during Mark talked once too often, and then I made a novice-teacher’s mistake.

A. when

B. as
C. while
D. whenever